The role of environmental factors on gene expression is illustrated by ____
a. the varying plant height of genetically identical yarrow plants when grown at different elevations
b. the flower color of hydrangeas
c. the coloration in snapdragon plants
d. male-pattern baldness
e. genetic variety in eye color
ANSWER: a
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A pine tree is a(n) ____, and a pine cone is a(n) ____
a. angiosperm; a seed b. haploid plant body; dipold plant body c. sporophyte; a gametophyte d. gametophye; a sporophye e. egg; pollen grain
The usual type of symbiotic relationship between humans and the bacteria normally found in their intestinal tract is that of
A. predator/prey. B. parasitism. C. mutualism. D. communism.
Which of the following organelles does NOT contain its own DNA?
A. Nucleus B. Chloroplast C. Rough endoplasmic reticulum D. Mitochondrion
How are the four types of nitrogen-containing bases in DNA held together in the double helix of DNA?
What will be an ideal response?